<template>
  <div>
      <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
     <el-card>
         <!-- 提示区域 -->
         <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon :closable='false'>
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>
        <!-- tab栏区 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-postion='top'>
            <el-tabs tab-position="left" v-model="activeIndex" :before-leave='beforeTabLeave' @tab-click='tabClicked'>
                <el-tab-pane label="基本信息" name='0'>
                    <el-form-item label='商品名称' prop='goods_name'>
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label='商品价格' prop='goods_price'>
                        <el-input v-model="addForm.goods_price" type='number'></el-input>
                    </el-form-item>
                    <el-form-item label='商品重量' prop='goods_weight'>
                        <el-input v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item label='商品数量' prop='goods_number'>
                        <el-input v-model="addForm.goods_number"></el-input>
                    </el-form-item>
                    <el-form-item label='商品分类' prop='goods_cat'>
                        <el-cascader
                        v-model="addForm.goods_cat"
                        :options="catelist"
                        expandTrigger= 'hover' 
                        :props="cateProps"
                        @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name='1'>
                    <!-- 渲染表单的item项 -->
                    <el-form-item :label='item.attr_name' v-for="item in manyTableData" :key='item.attr_id'>
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for='(cb,i) in item.attr_vals' :key='i' border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name='2'>
                    <!-- 渲染表单的item项 -->
                    <el-form-item :label='item.attr_name' v-for="item in onlyTableData" :key='item.attr_id'>
                        <!-- 复选框组 -->
                        <el-input v-model="item.attr_vals">
                        </el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name='3'>
                    <!-- action表示图片要上传到的后台API地址 -->
                    <el-upload
                    :action="uploadURL"
                    :on-preview="handlePreview"
                    :on-remove="handleRemove"
                    list-type="picture" :headers='headerObj' :on-success='handleSuccess'>
                    <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name='4'>
                    <!-- 富文本编辑器组件 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品按钮 -->
                    <el-button type='primary' class="btnAdd" @click='add'>添加商品</el-button>
                </el-tab-pane>
               
            </el-tabs>
        </el-form>
     </el-card>
    <!-- 图片预览 -->
     <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
    data(){
        return{
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    {required:true,message:'请输入商品名称',trigger:'blur'},
                ],
                goods_price:[
                    {required:true,message:'请输入商品价格',trigger:'blur'},
                ],
                goods_weight:[
                    {required:true,message:'请输入商品重量',trigger:'blur'},
                ],
                goods_number:[
                    {required:true,message:'请输入商品数量',trigger:'blur'},
                ],
                goods_cat:[
                    {required:true,message:'请选择商品分类',trigger:'blur'},
                ],
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表
            manyTableData:[],
            // 静态属性参数列表
            onlyTableData:[],
            // 上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !==200){
                return this.$message.error('获取商品分类数据失败！')
            }
            this.catelist = res.data
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange(){
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat =[]
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName === '0' && this.addForm.goods_cat.length !==3){
                this.$message.error('请先选择商品分类！')
                return false
            }
            
        },
        async tabClicked(){
            // 证明访问的是动态参数面版
            if(this.activeIndex === '1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                res.data.forEach(item =>{
                    item.attr_vals = item.attr_vals.length === 0 ? []: item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex === '2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(res.meta.status !== 200){
                    return this.$message.error('获取静态属性失败！')
                }
                this.onlyTableData = res.data
            }
            
            
        },
        // 处理图片预览效果
        handlePreview(file){
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的效果
        handleRemove(file){
            // 1.获取将要删除的图片的临时路径
            // 2.从pics数组中，找到这个图片对应的索引值
            // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
            const filePath = file.response.data.tmp_path
            const i = this.addForm.pics.findIndex(x =>x.pic === filePath)
            this.addForm.pics.splice(i,1)
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // 1.拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            // 2.将图片信息对象push到pics数组中
            this.addForm.pics.push(picInfo)
            
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                // 执行添加的业务逻辑
                // lodash cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item=>{
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item =>{
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                // 发起请求添加商品
                // 商品名称，必须是唯一的
                const {data:res} = await this.$http.post('goods',form)
                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
        }
    }
}
</script>

<style lang='less' scoped>
.el-checkbox{
    margin: 0 10px 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>